package com.itheima.student.system03.entry;

import com.itheima.student.system03.domain.Student;

import java.util.ArrayList;
import java.util.Scanner;


public class StudentEntry {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        ArrayList<Student> list = new ArrayList<>();
        loop:while (true) {
            System.out.println("--------欢迎来到学生管理系统--------");
            System.out.println("1 添加学生");
            System.out.println("2 删除学生");
            System.out.println("3 修改学生");
            System.out.println("4 查看学生");
            System.out.println("5 退出");
            System.out.println("请输入您的选择:");
            String choice = sc.next();
            switch (choice) {
                case "1":
                    //System.out.println("添加学生");
                    addStudent(list);
                    break;
                case "2":
                    //System.out.println("删除学生");
                    deleteStudent(list);
                    break;
                case "3":
                    //System.out.println("修改学生");
                     updateStudent(list);
                    break;
                case "4":
                    //System.out.println("查看学生");
                    findStudent(list);
                    break;
                case "5":
                    System.out.println("退出");
                    break loop;
                default:
                    System.out.println("您的输入有误,请重新输入:");
                    break ;

            }
        }

    }
        //  添加学生
    public static void addStudent(ArrayList<Student> list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入学生的学号:");
        String sid = null;
        while (true) {
            sid = sc.next();
            //  判断学号是否重复
            int index = getIndex(sid, list);
            if (index>=0){
                System.out.println("系统中已有此学号,请重新输入:");
            }else {
                System.out.println("请继续");
                break;
            }
        }
        System.out.println("请输入学生的姓名:");
        String name = sc.next();
        System.out.println("请输入学生的年龄:");
        int age = sc.nextInt();
        System.out.println("请输入学生的性别:");
        String gender = sc.next();
        System.out.println("请输入学生的生日:");
        String birthday = sc.next();
        Student student = new Student(sid,name,age,gender,birthday);
        list.add(student);
        System.out.println("该学生已录入系统!");

    }
    //  删除学生
    public static void deleteStudent(ArrayList<Student> list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入想要删除的学生学号:");
        String sid = sc.next();
        int index = getIndex(sid, list);
        if (index>=0){
            list.remove(index);
            System.out.println("该学生已在系统中删除!");
        }else{
            System.out.println("该学生不在系统中,无需删除!");
        }

    }
        // 修改学生
    public static void updateStudent(ArrayList<Student> list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入你要修改的学生学号:");
        String sid = sc.next();
        int index = getIndex(sid, list);
        if (index>=0){
            System.out.println("请输入学生的姓名:");
            String name = sc.next();
            System.out.println("请输入学生的年龄:");
            int age = sc.nextInt();
            System.out.println("请输入学生的性别:");
            String gender = sc.next();
            System.out.println("请输入学生的生日:");
            String birthday = sc.next();
            Student student = new Student(sid,name,age,gender,birthday);
            list.set(index,student);
            System.out.println("该学生信息已修改!");
        }else {
            System.out.println("系统没有该学生,请重新输入:");
        }

    }
            //  查看学生
    public static void findStudent(ArrayList<Student> list) {

        if (list.size()==0){
            System.out.println("系统没有该学生,请重新输入:");
        }
        System.out.println("学号"+"\t"+"姓名"+"\t"+"年龄"+"\t"+"性别"+"\t"+"生日");
        for (int i = 0; i < list.size(); i++) {
           // list.get(i)
            Student student = list.get(i);
            System.out.println(student.getSid()+"\t"+student.getName()+"\t"+student.getAge()+"\t"+student.getGender()+"\t"+student.getBirthday());

        }

    }
    //  判断学号是否在系统中
    // 参数  输入的sid    现有的集合 ArrayList<Student> list
    // 返回值 int类型的index
    public static int getIndex(String sid,ArrayList<Student> list){
        for (int i = 0; i < list.size(); i++) {
          //  list.get(i)
            Student student = list.get(i);
            if (student.getSid().equals(sid)){
                return i;
            }
        }
     return -1;
    }
}
